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Download Support worksheet – Topic 3 Questions
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Cambridge Physics for the IB Diploma Support Worksheet – Option E, Worksheet 1 1 State the difference between a constellation and a stellar cluster. [2] 2 Describe the nature of a star. [2] 3 State the source of energy in a star. [1] 4 Suggest how a star manages to be in equilibrium without collapsing under its own weight. [2] 5 Define the luminosity of a star and state two factors that affect the luminosity of a star. [3] 6 Two stars have the same surface temperature but star X has double the radius of star L Y. Calculate the ratio of luminosities X . LY [2] Two stars have the same radius but star X has double the surface temperature of star L Y. Calculate the ratio of luminosities X . LY [2] 8 Define apparent brightness. [1] 9 Two stars have the same luminosity but the distance from Earth to star X is double the b distance to star Y. Calculate the ratio of apparent brightness X . bY [2] Two stars have the same apparent brightness but the distance from Earth to star X is L double the distance from Earth to star Y. Calculate the ratio of luminosities X . LY [2] 7 10 11 Calculate the distance to a star whose luminosity is 4.5 1028 W and its apparent brightness is 6.2 1012 Wm2 . [2] The peak wavelength in the spectrum of a star is 520 nm. Calculate the surface temperature of the star. [2] 13 State one property of a star that is determined by its spectral class. [1] 14 State the spectral class of our Sun. [1] 12 Copyright Cambridge University Press 2012. All rights reserved. Page 1 of 2 Cambridge Physics for the IB Diploma 15 Complete the HR diagram below to show L T 16 a the main sequence [1] b the white dwarf region [1] c the red giant region [1] d Cepheid variables. [1] Two stars, labelled A and B are shown in the HR diagram below. L . . A B T State and explain which star, A or B, has the greater radius. 17 [2] Two stars, labelled A and B are shown in the HR diagram below. L . . A B T 18 19 State and explain which star, A or B, has the greater radius. [2] Describe how the stellar parallax method may be used to determine the distance to a star. [3] Suggest why the stellar parallax method is limited to distances of about 300 pc for Earth-based telescopes but can be extended to 1000 pc for satellite-based telescopes. [2] Copyright Cambridge University Press 2012. All rights reserved. Page 2 of 2